2021 Volume 37 Issue 1 Pages 13-22
This study measured skeletal muscle mass index （SMI） and grip strength for 53 healthy young women aged 20–21 years. Subjects were classifed into a low SMI （LSm） group） with SMI <5.7 kg/m2 and a normal SMI （NSm） group） with SMI ≥5.7 kg/m2. Perception of current body type, dietary behaviors, and dietary and food group intakes were compared between groups.
The LSm group （37.7%） showed signifcantly lower body mass index （BMI）, grip strength, saturated fatty acid levels, and calcium intake than the NSm group. However, no signifcant diﬀerences in body fat percentage, fat mass index, perception of body type, or dietary behaviors were evident between groups. BMI, grip strength, and dietary intake for the overall cohort were roughly the same as national health and nutrition examination survey for Japanese women in their 20s, but these values were lower in the LSm group.
These results suggest that about 40% of healthy young women today have low skeletal muscle mass.